pettijohn



No. 82,242. PATENTED SEPT. 15, 1868. W. G. PETTIJOHN.

' LIMEKILN'-' Witnesses: v r I Inventor.

WILLIAM G. PETTIJOHN, OF ST. LOUIS. MISSOURI.

Letters Patent No. 82,242, dated September 15, 1868.

IMPROVEMENT IN LIME-KILNS.

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TO ALL WHOM ITM A Y CONCERN:

Be it known that I, WILLIAM C. PETTIJOHN, of St. Louis, in the, county of St. Louis, and State of Missouri,

have made certain new and useful Improvements in Lime-Kilns; and I do hereby declare that the following is a full and clear description thereof, reference being bad to the accompanying drawings, and to the letters of reference marked thereon. i

This invention has for its object the construction of a lime-kiln, in such a manner as to permit the burningoperation to be performed continuously, the kiln being fed from the top with both stone and fuel, and so arranged at the bottom as to discharge the ashes and refuse matter from the kiln into an ash-pit prepared to receive them, while the burned stone are drawn ofi' through an aperture at the side of the kiln, just above the said ash-pit. The kiln is also provided with a metallic cover, arranged to be readily placed over the mouth of the kiln, and provided with an aperture for the emission of smoke, just sulficiently large to permit the escape of the smoke after the kiln shall have become fully fired up.

To enable those skilled in the art to make and use my improved kiln, I will proceed to describe its ecu: struction and operation.

Figure 1,-ofthedrawings, is a vertical central section of the improved kiln, looki'ng toward the front of the same. i I

Figure 2 is a top plan of the kiln. v

The walls, A, are constructed sons to form the kiln-chamber, A, in an egg-shape, this shape being best adapted to free the superior mass-of stone in the kiln, as the finished lime is drawn out below,'a nd also causes the heat generated within the kiln to act in a reverberatory manner upon the mass of stone under treatment. The base of the kiln-chamber is covered with an iron grating, a, immediately'below which is an ash-pit, B. Just above the grate there is an aperture, (1, in the side of the kiln, through which the calcined stone is to be drawn. The refuse matter of the kiln and ashes will pass down through the grating a into the ash-pit B, from whence it may easily be removed at pleasure. The top of the kiln is to be covered by a metallic dome, D, made in two pieces, as clearly shown in fig. 2, which pieces are pivoted at d, and arranged to slide back into the positions ,shown by the dotted lines cl in fig. 2. There may be curved rails under the outer ends of these cap-pieces, to sustain them while being run back off of the kiln. An aperture, d must be left in the dome, for the discharge of the smoke and hot gases from the kilnzdurihg the burning-operation. When this cap is closed, it will give increased reverberatory effect to the kiln.

When this kiln is first charged, it will be fired at the bottom, directly over the grate, and it will be allowed to burn from the bottom until the lower portion of stone in the kiln is thoroughly calcined, after which the new fuel (coal or coke willi b'e'used) will beintroduccd from the top, al ng, with the stone, in the proper proportions for thorough burningof the mass. When the bottom pertion'ofthe stone in the kiln shall have been thoroughly burned, it will be drawn ofi through theaperturea. After the firstcharge of the kiln, the fire will seldom extend down more than two-thirds of the way from the top, while the air for feeding the fire will have'to pass up through this finished mass at the bott'o ui of thev kiln; whic'hwill thereby be cooled oif, preparatory to drawing it from the ki-ln.

I amaware that the'devices herein described, --tak'en separately, are of themselves not new, andIdo therefore in nowise-claim said individual devices; but

What I do claim, anddesire to secure by LettersaP-atent, is

The arrangement ofv the kiln A, havingthe chamber A, grate a, ash-pit B, side aperture a, metallic dome D, constructed in. two parts, and having the smoke-iexitid all combined substantially as herein set forth.

WM. O. PETTIJOH'N.

Witnesses:

M. RANDOLPH, Jim. W. Hartman. 

